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1997 Volvo 850 Vacuum Hose Routing Questions

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Chuck W
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by Chuck W » Sun Oct 20, 2019 6:47 pm

If I get a chance tomorrow, I'll take some pics of my '97 T5.

Your post is all over the place and it's giving me a headache. :)

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BlackBart
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by BlackBart » Sun Oct 20, 2019 9:27 pm

It doesn't go to the valve assembly on the backside top of the radiator, does it? Right above the fan. Mine has something similar, but it's a '94 so that may be incorrect information.

I ran out and checked - mine has two yellow hard plastic lines that look to go from the vac tree on the manifold to the valve at the top of the radiator. It's mostly hidden by the elbow of the intercooler hose.


< EDIT > "purge valve?"
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abscate
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by abscate » Sun Oct 20, 2019 11:44 pm

It’s much easier to route hoses when you understand function.

The purge valve sits on the radiator with one end connected to the canister. It needs vacuum to suck the canister empty.

In a turbo engine , the intake manifold runs in vacuum on coast and light load, but under pressure in heavy load.

The snorkel is under atmospheric pressure at light load,vacuum under heavy load.

So, the purge valve connects to both, and small check valves prevent the one under pressure from ruining the vacuum.
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Chuck W
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by Chuck W » Mon Oct 21, 2019 2:02 pm

Some pics from my '97 T5.
Image
ImageImageImageImage

Your mystery hose is for your boost gauge.
I have one hose going from the TCV (the part labeled 16 in the diagram) to the turbo wastegate (the yellow hose in the diagram). That seems right.

I have a second hose going from the TCV to the turbo compressor (the green hose in the diagram). That seems right.

I have a third hose going from the TCV to one nipple on the hose to the turbo (the blue hose in the diagram). That seems right.

I have a fourth hose that's supposed to go from the turbo to the front of the intake manifold (the red hose in the diagram). Is that right?

I have a fifth hose that goes from another nipple on the turbo hose (by the PCV) and I don't know where it goes. This is a stumper. There doesn't seem to be anyplace it can go.
Hose #4 goes from your CBV to the lower of the two ports on the front of the intake manifold.
Hose #5 does not exist on my car. You can see that it is capped off (I did that, as I was missing parts from the PO).

However, according to abscate, I should grab another check valve and add the T and the hose #5 to my set-up.
Turbo cars vent the Evap system in two places, one from the intake manifold and the other from the snorkel ( the big fat hose between air cleaner and turbo.

That’s your missing hose.
Buy a T, get a check valve and connect #5 as mentioned.

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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by shaolinpat » Mon Oct 21, 2019 4:45 pm

abscate and Chuck W,

Thanks for the description and the pictures.

I think the PO just cut out the the t-connection and the hose altogether.

Here's the part number: 9445436. It's $75 on ebay for the whole assembly.

I think I'm going to go with a check valve from an S40 that's only $21 from fcpeuro.com (part number 1275226). I can get clamps and a T-connection for a few bucks and be in business.

If that's a bad idea (or there are better ideas), let me know before I order.

Chuck W
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by Chuck W » Mon Oct 21, 2019 9:44 pm

Yeah, no need for a $75 hose assembly...

When we did the engine swap in the wife's '97 GLT, I replaced all of that nonsense with silicone hoses anyway.

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erikv11
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by erikv11 » Mon Oct 21, 2019 9:50 pm

About OP's original post: start with this viewtopic.php?t=63615
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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smoggyama
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Re: 1997 Volvo 850 Vacuum Hose Routing Questions

Post by smoggyama » Mon Dec 09, 2019 10:10 pm

Doesn't that connect to the vacuum tree (other end is manifold under the thermostat)?
Life is like a box of chocol- make that an engine compartment. You never know where all the hoses go. Unless you read the diagram on the hood. When all else fails, follow the instructions. Do it right the 2nd time.
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